Can the headphone jack on the Denon 3312 drive 300-ohm headphones?
Like the Sennheiser HD600/HD650?
Can the Denon 3312 drive 600-Ohm headphones?
How is the sound quality over all, for headphones plugged into the Denon 3312?
So your problem is similar to mine. I was able to "fix" it and haven't had the clicking come back for more than a month now. I'm not sure what fixed it but while the receiver was on and the center channel had gone out, I lifted the receiver a bit (less than 1/4") and I accidentally dropped it right after that I heard a relay click and my center was back on. I then disconnected the cables and cleaned it out real good with air turning the receiver on its side and what not. I'm not sure if the dusting fixed it or the small drop... I'm thinking the small drop caused one of the relays to "unstick" or reset it self somehow.